Associated constants cannot be used to initialize storage fields

[ironcev]

Associated constants cannot be used to initialize storage fields. E.g., the following code results in a compilation error:

contract;

struct S {}

impl S {
    const S_ASSOC: u8 = 0;
}

storage {
    s_assoc: u8 = S::S_ASSOC,
                     ^^^^^^^ Could not evaluate initializer to a const declaration.
}

If the associated constant was used before to initialize some other module constant, e.g., const CONST: u8 = S::S_ASSOC; the initialization will be possible.

This is very likely because we have a dedicated step that compiles module constants solely for the purpose of using them in the storage initialization. Associated constants are not part of that compilation step.

When fixing this issue, adjust the associated_const_in_decls_of_other_constants test which is linked to this issue via GitHub link in the test TODO.